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****************************************************************************/

#include "qwindowsguieventdispatcher.h"
#include "qwindowscontext.h"

#include <QtGui/QWindowSystemInterface>

#include <QtCore/QStack>
#include <QtCore/QDebug>

#include <windowsx.h>

QT_BEGIN_NAMESPACE

/*!
    \class QWindowsGuiEventDispatcher
    \brief Event dispatcher for Windows

    Maintains a global stack storing the current event dispatcher and
    its processing flags for access from the Windows procedure
    qWindowsWndProc. Handling the Lighthouse gui events should be done
    from within the qWindowsWndProc to ensure correct processing of messages.

    \ingroup qt-lighthouse-win
*/

typedef QStack<QWindowsGuiEventDispatcher::DispatchContext> DispatchContextStack;

Q_GLOBAL_STATIC(DispatchContextStack, dispatchContextStack)

QWindowsGuiEventDispatcher::QWindowsGuiEventDispatcher(QObject *parent) :
    QEventDispatcherWin32(parent)
{
    setObjectName(QStringLiteral("QWindowsGuiEventDispatcher_0x") + QString::number((quintptr)this, 16));
    if (QWindowsContext::verboseEvents)
        qDebug("%s %s", __FUNCTION__, qPrintable(objectName()));
    dispatchContextStack()->push(DispatchContext(this, QEventLoop::AllEvents));
}

QWindowsGuiEventDispatcher::~QWindowsGuiEventDispatcher()
{
    if (QWindowsContext::verboseEvents)
        qDebug("%s %s", __FUNCTION__, qPrintable(objectName()));
    if (!dispatchContextStack()->isEmpty())
        dispatchContextStack()->pop();
}

bool QWindowsGuiEventDispatcher::processEvents(QEventLoop::ProcessEventsFlags flags)
{
    DispatchContextStack &stack = *dispatchContextStack();
    if (QWindowsContext::verboseEvents > 2)
        qDebug(">%s %s %d", __FUNCTION__, qPrintable(objectName()), stack.size());
    stack.push(DispatchContext(this, flags));
    const bool rc = QEventDispatcherWin32::processEvents(flags);
    stack.pop();
    if (QWindowsContext::verboseEvents > 2)
        qDebug("<%s %s returns %d", __FUNCTION__, qPrintable(objectName()), rc);
    return rc;
}

QWindowsGuiEventDispatcher::DispatchContext QWindowsGuiEventDispatcher::currentDispatchContext()
{
    const DispatchContextStack &stack = *dispatchContextStack();
    if (stack.isEmpty()) {
        qWarning("%s: No dispatch context", __FUNCTION__);
        return DispatchContext(0, 0);
    }
    return stack.top();
}

// Helpers for printing debug output for WM_* messages.
struct MessageDebugEntry
{
    UINT message;
    const char *description;
    bool interesting;
};

static const MessageDebugEntry
messageDebugEntries[] = {
    {WM_CREATE, "WM_CREATE", true},
    {WM_PAINT, "WM_PAINT", true},
    {WM_CLOSE, "WM_CLOSE", true},
    {WM_DESTROY, "WM_DESTROY", true},
    {WM_MOVE, "WM_MOVE", true},
    {WM_SIZE, "WM_SIZE", true},
    {WM_MOUSEACTIVATE,"WM_MOUSEACTIVATE", true},
    {WM_CHILDACTIVATE, "WM_CHILDACTIVATE", true},
    {WM_PARENTNOTIFY, "WM_PARENTNOTIFY", true},
    {WM_GETICON, "WM_GETICON", false},
    {WM_KEYDOWN, "WM_KEYDOWN", true},
    {WM_SYSKEYDOWN, "WM_SYSKEYDOWN", true},
    {WM_SYSCOMMAND, "WM_SYSCOMMAND", true},
    {WM_KEYUP, "WM_KEYUP", true},
    {WM_SYSKEYUP, "WM_SYSKEYUP", true},
    {WM_IME_CHAR, "WM_IMECHAR", true},
    {WM_IME_KEYDOWN, "WM_IMECHAR", true},
    {WM_CANCELMODE,  "WM_CANCELMODE", true},
    {WM_CHAR, "WM_CHAR", true},
    {WM_DEADCHAR, "WM_DEADCHAR", true},
    {WM_ACTIVATE, "WM_ACTIVATE", true},
    {WM_GETMINMAXINFO, "WM_GETMINMAXINFO", true},
    {WM_SETFOCUS, "WM_SETFOCUS", true},
    {WM_KILLFOCUS, "WM_KILLFOCUS", true},
    {WM_ENABLE, "WM_ENABLE", true},
    {WM_SHOWWINDOW, "WM_SHOWWINDOW", true},
    {WM_GETMINMAXINFO, "WM_GETMINMAXINFO"},
    {WM_WINDOWPOSCHANGING, "WM_WINDOWPOSCHANGING", true},
    {WM_WINDOWPOSCHANGED, "WM_WINDOWPOSCHANGED", true},
    {WM_SETCURSOR, "WM_SETCURSOR", false},
    {WM_GETFONT, "WM_GETFONT", true},
    {WM_NCMOUSEMOVE, "WM_NCMOUSEMOVE", true},
    {WM_LBUTTONDOWN, "WM_LBUTTONDOWN", true},
    {WM_LBUTTONUP, "WM_LBUTTONUP", true},
    {WM_LBUTTONDBLCLK, "WM_LBUTTONDBLCLK", true},
    {WM_RBUTTONDOWN, "WM_RBUTTONDOWN", true},
    {WM_RBUTTONUP, "WM_RBUTTONUP", true},
    {WM_RBUTTONDBLCLK, "WM_RBUTTONDBLCLK", true},
    {WM_MBUTTONDOWN, "WM_MBUTTONDOWN", true},
    {WM_MBUTTONUP, "WM_MBUTTONUP", true},
    {WM_MBUTTONDBLCLK, "WM_MBUTTONDBLCLK", true},
    {WM_MOUSEWHEEL, "WM_MOUSEWHEEL", true},
    {WM_XBUTTONDOWN, "WM_XBUTTONDOWN", true},
    {WM_XBUTTONUP, "WM_XBUTTONUP", true},
    {WM_XBUTTONDBLCLK, "WM_XBUTTONDBLCLK", true},
    {WM_MOUSEHWHEEL, "WM_MOUSEHWHEEL", true},
    {WM_NCCREATE, "WM_NCCREATE", true},
    {WM_NCCALCSIZE, "WM_NCCALCSIZE", true},
    {WM_NCACTIVATE, "WM_NCACTIVATE", true},
    {WM_NCMOUSELEAVE, "WM_NCMOUSELEAVE", true},
    {WM_NCLBUTTONDOWN, "WM_NCLBUTTONDOWN", true},
    {WM_NCLBUTTONUP, "WM_NCLBUTTONUP", true},
    {WM_ACTIVATEAPP, "WM_ACTIVATEAPP", true},
    {WM_NCPAINT, "WM_NCPAINT", true},
    {WM_ERASEBKGND, "WM_ERASEBKGND", true},
    {WM_MOUSEMOVE, "WM_MOUSEMOVE", true},
    {WM_MOUSELEAVE, "WM_MOUSELEAVE", true},
    {WM_NCHITTEST, "WM_NCHITTEST", false},
    {WM_IME_SETCONTEXT, "WM_IME_SETCONTEXT", true},
    {WM_IME_NOTIFY, "WM_IME_NOTIFY", true},
#if defined(WM_DWMNCRENDERINGCHANGED)
    {WM_DWMNCRENDERINGCHANGED, "WM_DWMNCRENDERINGCHANGED", true},
#endif
    {WM_IME_SETCONTEXT, "WM_IME_SETCONTEXT", true},
    {WM_IME_NOTIFY, "WM_IME_NOTIFY", true},
    {WM_TOUCH, "WM_TOUCH", true},
    {WM_CHANGECBCHAIN, "WM_CHANGECBCHAIN", true},
    {WM_DRAWCLIPBOARD, "WM_DRAWCLIPBOARD", true},
    {WM_RENDERFORMAT, "WM_RENDERFORMAT", true},
    {WM_RENDERALLFORMATS, "WM_RENDERALLFORMATS", true},
    {WM_DESTROYCLIPBOARD, "WM_DESTROYCLIPBOARD", true},
    {WM_CAPTURECHANGED, "WM_CAPTURECHANGED", true}
};

static inline const MessageDebugEntry *messageDebugEntry(UINT msg)
{
    for (size_t i = 0; i < sizeof(messageDebugEntries)/sizeof(MessageDebugEntry); i++)
        if (messageDebugEntries[i].message == msg)
            return messageDebugEntries + i;
    return 0;
}

const char *QWindowsGuiEventDispatcher::windowsMessageName(UINT msg)
{
    if (const MessageDebugEntry *e = messageDebugEntry(msg))
        return e->description;
    return "Unknown";
}

QT_END_NAMESPACE